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  1. Answers
    2,332
    Views
    231,452

    Re: Thoughts of the day.

    Courage is not the absence of fear, but rather the judgement that something else is more important than fear.
  2. Oracle Re: Add a new column to a table and insert values

    >>what is table mutation error and what is the occation it will happen

    Follow the link
  3. Answers
    2,332
    Views
    231,452

    Re: Thoughts of the day.

    “Great dreams of great dreamers are always transcended.” - Abdul Khalam
  4. Answers
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    37,855

    Oracle Re: Dual Table in Oracle

    SQL> SELECT greatest(12,54,2,75,142) from dual;

    GREATEST(12,54,2,75,142)
    ------------------------
    142


    Max function takes only one parameter.

    SQL> SELECT max(sal)...
  5. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    Exports & Imports

    1.In order to use exp & imp the catexp.sql must be run. It creates exp_full_database and impfull_database roles.

    2.Objects owned by sys can't be exported.

    3.To see help on...
  6. Answers
    2,332
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    231,452

    Re: Thoughts of the day.

    Coming together is beginning
    Keeping together is progress
    Working together is success - Henry Ford
  7. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    When an instance is started, if SPFILE is present, it will be used; otherwise, Oracle searches for a default PFILE.Oracle will scan the files in the following order:

    1) spfileSID.ora
    2)...
  8. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    How can we know whether a parameter in parameter file is modifiable or not?


    SQL> select distinct issys_modifiable from v$parameter;

    ISSYS_MODIFIABLE
    —————————
    DEFERRED
    FALSE
    IMMEDIATE
  9. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    How to know whether database is using pfile or spfile?

    sql> select decode(value, null, 'pfile', 'spfile') "parameter file"
    2 from sys.v_$parameter where name = 'spfile';

    parame
    ------...
  10. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    Advantages of SPFILE over PFILE

    SPFILEs are available in Oracle 9i and above. All prior releases of Oracle are using PFILEs.

    1.An SPFILE can be backed-up with RMAN and PFILE can't.
    2.The...
  11. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    SPFILE and PFILE

    SPFILE stands for server parameter file.
    Initialisation parameter file init.ora is also called as pfile.

    These files hold setup parameters that defines attirbutes of instance....
  12. Answers
    2,332
    Views
    231,452

    Re: Thoughts of the day.

    “Any man who reads too much and uses his own brain too little falls into lazy habits of thinking” – - Albert Einstein
  13. Answers
    2
    Views
    1,176

    Oracle Re: sql file problem

    Why are you querying the database in this fashion with scripts that have not been tested ?
  14. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    Indexes and between operator

    Between operator will consider indexes if there index on a column.
    Between is treated as a pair of comparison operators.


    sql> select *
    2 from emp
    ...
  15. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    Indexes and Comparing columns in the same table

    Comparing the columns in the same table makes an index useless.



    sql> select empno, ename, job, mgr
    2 from emp
    3 where empno =...
  16. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    Indexes and Like operator

    you can take advantage of an index with like as long as you provide the first character in the pattern.



    sql> select ename, job, sal
    2 from emp
    3 where...
  17. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    Choosing Between Having and Where

    Where puts condition on the table rows.
    Having puts condition on grouped results.

    The processing order is as follows.
    1. Select rows with WHERE
    2. Divide...
  18. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    Control File Related Views

    V$CONTROL FILE :- This view lists the names of the control files.



    SQL> SELECT name
    2 FROM v$controlfile;

    NAME
  19. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    Dynamic performanc views - IV

    V$BGPROCESS :- This process describes the background processes.

    V$BH:- This is a parallel server view. This view gives the status and number of pings for every...
  20. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    Dynamic performanc views - III

    V$instance :- It displays information of the current instance.



    SQL> SELECT instance_name,
    2 version,
    3 status,
    4...
  21. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    Dynamic performanc views - II

    II.v$sgastat
    It constains detailed information on the system global area or contains information on sga segment sizes


    sql> select *
    2 from v$sgastat; ...
  22. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    Dynamic performanc views - I

    Dynamic performance views are identified by the prefix v_$.
    Public synonyms for these views have the prefix v$.
    The v$ views provide a continually updated look at...
  23. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    Startup Command options

    I.STARTUP FORCE
    1.It aborts the current instance
    2.Starts a new normal instance

    II.STARTUP RESTRICT
    1.It restrict connection to users with the RESTRICTED SESSION...
  24. Answers
    193
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    25,084

    Sticky: Re: Geeks - Tip of the Day

    Starting Up a Database

    Database can be started up in various stages.

    I. Nomount
    This stage is used to
    1.Create a database
    2.To recreate a control file.

    It includes the following tasks
  25. Answers
    193
    Views
    25,084

    Sticky: Re: Geeks - Tip of the Day

    Database Shutdown -II


    III.Shutdown Immediate
    1.No New connections are allowed.
    2.Connected clients are disconnected and Sql Statements in process are not completed.
    3.Oracle rollback active...
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